IW1820-31

AC DC Converters, Offline Switchers Overview

The iW1820-31 is a switching controller from the AccuSwitch family, designed for 15W quasi-resonant PWM applications. It integrates an 800V power BJT and utilizes primary-side regulation to eliminate optocouplers. The device operates in a flyback topology with a switching frequency of 72 kHz. It supports output voltages up to 19 V and functions within a temperature range of -40°C to +150°C. Packaged in SOIC-10 SMD/SMT, it draws 25 mA operating current and delivers 15 W output power.

AC DC Converters, Offline Switchers Feature Summary

• Integrates an 800V bipolar junction transistor (BJT) for compact design
• Employs proprietary AccuSwitch technology for primary-side control
• Eliminates the need for optocouplers and secondary feedback components
• Features built-in fault protection including current limiting and over-temperature shutdown

AC DC Converters, Offline Switchers Applications

• Low-power AC/DC adapters
• Standby power supplies
• Consumer electronics chargers

AC DC Converters, Offline Switchers Procurement Notes

Verify component authenticity through authorized Renesas distributors or certified partners. Confirm RoHS compliance status via official datasheets. Check lifecycle status as supply may be restricted. Validate package integrity upon receipt. Ensure storage conditions meet manufacturer specifications to maintain reliability.

AC DC Converters, Offline Switchers Selection Notes

Select this controller for designs requiring high integration and reduced bill of materials. The integrated 800V BJT simplifies layout compared to discrete solutions. Primary-side regulation reduces component count. Suitable for cost-sensitive applications where isolation requirements are met by transformer design rather than feedback loops.

AC DC Converters, Offline Switchers Part Context

Part of the iW1820 series, which focuses on efficient power management for low-wattage applications. The series emphasizes simplicity and reliability by removing complex secondary-side control circuits. This specific variant targets 5V application profiles within the broader 15W capability envelope.

AC DC Converters, Offline Switchers Replacement Considerations

No public confirmed substitute part numbers are available in the provided documentation. Consult Renesas technical support for direct replacements or pin-compatible alternatives if discontinuation occurs.

AC DC Converters, Offline Switchers FAQ

Does the iW1820-31 require an optocoupler?

No, it uses proprietary primary-side control technology to eliminate the need for optocouplers.

What is the maximum voltage rating of the integrated power BJT?

The integrated power BJT has an 800V rating.